// Copyright 2016 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef CONTENT_BROWSER_MEDIA_SESSION_PEPPER_PLAYBACK_OBSERVER_H_
#define CONTENT_BROWSER_MEDIA_SESSION_PEPPER_PLAYBACK_OBSERVER_H_

#include <map>
#include <memory>
#include <stdint.h>
#include <utility>

#include "base/macros.h"

namespace content {

class PepperPlayerDelegate;
class RenderFrameHost;
class WebContents;

// Class observing Pepper playback changes from WebContents, and update
// MediaSession accordingly. Can only be a member of WebContents and must be
// destroyed in ~WebContents().
class PepperPlaybackObserver {
public:
    explicit PepperPlaybackObserver(WebContents* contents);
    virtual ~PepperPlaybackObserver();

    void RenderFrameDeleted(RenderFrameHost* render_frame_host);

    void PepperInstanceCreated(RenderFrameHost* render_frame_host,
        int32_t pp_instance);
    void PepperInstanceDeleted(RenderFrameHost* render_frame_host,
        int32_t pp_instance);
    // This method is called when a Pepper instance starts making sound.
    void PepperStartsPlayback(RenderFrameHost* render_frame_host,
        int32_t pp_instance);
    // This method is called when a Pepper instance stops making sound.
    void PepperStopsPlayback(RenderFrameHost* render_frame_host,
        int32_t pp_instance);

private:
    using PlayerId = std::pair<RenderFrameHost*, int32_t>;

    // Owning PepperPlayerDelegates.
    using PlayersMap = std::map<PlayerId, std::unique_ptr<PepperPlayerDelegate>>;
    PlayersMap players_map_;

    // Map for whether Pepper players have ever played sound.
    // Used for recording UMA.
    //
    // The mapped player ids must be a super-set of player ids in |players_map_|,
    // and the map is also used for cleaning up when RenderFrame is deleted or
    // WebContents is destructed.
    using PlayersPlayedSoundMap = std::map<PlayerId, bool>;
    PlayersPlayedSoundMap players_played_sound_map_;

    // Weak reference to WebContents.
    WebContents* contents_;

    DISALLOW_COPY_AND_ASSIGN(PepperPlaybackObserver);
};

} // namespace content

#endif // CONTENT_BROWSER_MEDIA_SESSION_PEPPER_PLAYBACK_OBSERVER_H_
